49ers' Ray McDonald again joins practice late

SANTA CLARA -- Defensive tackle Ray McDonald joined the 49ers practice late for a second straight day, and it's not immediately known if that's related to his early Sunday arrest on domestic violence charges.

The 49ers are expected to issue a participation report by 5 p.m. regarding practice, which was closed to the media after 20 minutes. A team spokesman alerted the media that McDonald took the field shortly after reporters left, and the reason for his tardiness wasn't immediately revealed.

General manager Trent Baalke and coach Jim Harbaugh conversed at the start of practice but it's unknown if their conversation was related to McDonald, who they've insisted will receive "due process" before the organization decides his fate for Sunday's game and beyond.

McDonald practiced the past two days, though he came out 20 minutes late Wednesday after a possible meeting with the team's front office. The Santa Clara County District Attorney's office hasn't announced yet if it will charge McDonald following his early Sunday morning arrest at his San Jose home.

Wide receiver Michael Crabtree returned to practice. A calf injury caused him to miss Wednesday's session and instead work out in the weight room.

Right tackle Anthony Davis was missing a second straight day of practice because of a hamstring strain. Davis hasn't missed a start in his four seasons, but if he does, Jonathan Martin is in line to fill in as he did throughout the exhibition season.